Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 27: Theorie

HK 27.7: Talk

Tuesday, March 8, 2005, 15:30–15:45, TU MA005

In-medium properties of N(1535) in chiral models probed by η mesic nucleus — •Daisuke Jido¹, Hideko Nagahiro², and Satoru Hirenzaki² — ¹Phyisik-Department, Technische Universität München,James-Franck-Strasse, D-85747 Garching — ²Department of Physics, Nara Women’s University, Nara 630-8506, Japan

In this talk, we discuss in-medium properties of the N(1535) resonance within two kinds of chiral models, chiral doublet model and chiral unitary model, and investigate the formation of the η-nucleus bound systems (η mesic nuclei) under N^* dominance hypothesis in the η-nucleon system. The two chiral models are based on different physical pictures of the N(1535) resonance and give distinct consequences of the in-medium properties of N(1535). The chiral doublet model suggests a reduction of the mass difference of the nucleon and N(1535) in nuclear medium, and it turns the η optical potential to be repulsive at center of nucleus. On the other hand, N(1535) in the chiral unitary model is insensitive to the medium effect and the η optical potential is to be attractive. In order to see the physical implications of these consequences, we show the formation rates of the η mesic nuclei calculated with the η optical potentials based on these chiral models. We find a clear difference in the global shapes of the formation spectra, which will be distinguished in experiment.

[1] D. Jido, H. Nagahiro and S. Hirenzaki, Phys. Rev. C 66 (2002) 045202; H. Nagahiro, D. Jido and S. Hirenzaki, ibid. 68 (2003) 035205.

^*Work of D.J. in Germany is supported by AvH.